Viewing & Rendering

Perspective Projection vs. Perspective Transformation

Perspective Projection calculates the perspective view (i.e., foreshortening) of a 3D object onto a 2D projection plane. The effect of viewing in perspective is achieved, and, of course, the z-values (depth information) are discarded in the process.
The Perspective Transformation allows us to see how the perspectively foreshortened and projected polygons will overlap, without discarding the z-values (which we need to use later for depth comparison).

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